■$M&$fc : 



W 



289 



chamber; living chamber more than thru- times as long as 

 its basal diameter; siphuncle one-third the diameter <>f tin- 

 shell from the margin. 



Found in the "Hamilton 

 group, on the south Shore of 

 Lake Erie" (Hall); doubtfully 

 in and above the Modiomorpha 

 bed. 



E T HOCE R A S T E L AMI! N . 



Hall. (Fig. 223.) (Pal. N. Y., 

 Vol. V., Pt. II., p. 291, PI. 

 LXXXV.) 



Distinguishing ( Characters. — 

 Regularly and gradually enlarg- 

 ing tube ; circular cross-section : 

 apical angle four degrees; cylin- 

 drical living chamber about 

 three times as long as its basal 

 diameter; depth of air cham- 

 bers 5 mm., where diameter of 

 shell is 9 mm.; concavity of 

 septa equal to an arc of about 

 110 degrees; large excentric 

 siphuncle, less than one-third 

 diameter from the margin. 



Found in the Encrinal lime- 

 stone, at Section 5 (rare, and 



Fig. 225. Orthoce- gomewliat doubtful ). 

 ras nuntium. Natu- 



^n^thfsSrCe OrTHOCEBAB AULAX. Hall. 



enlarged (after Hall). ^pig. 224:.) ( Pal. N. Y., Vol. V., 



iJjiftS&i 



WWr 



,ii»!lfltotW&, 



jiitiStasWiIs . 



i 



Hi ; M 



Pt. II., p. 293, PL LXXXIV.) 

 Distinguishing Characters.— Slen der, v e r y 



-,,■,,. i .1 .. Fk; 886A. Ortho- 



gradually enlarging tube; numerous regular, <.,.,„, .,„„,„, ■„,„,„. 



f -. ■, j! -i ij- The type species 



low, rounded, transverse surface ridges, about from LokeEflecaJ 



twelve in the space of 10 mm., with regularly 



concave interspaces, equal in width to the ridges; fine, sharp 



longitudinal striae. 



•' 



• ■ -. ■ V 



